In Reply to: Would you mind sharing the name of the sites? I have been posted by searching for generic potassium chloride 10 mEq ER tablets, and ... sm on Thu, Sep 09 2021 at 05:54 PM CDT:
You could just buy the fairly common 99 mg tablets and take 2-1/2 of them every 8 hours for 10 mEq of "extended release". If you need a different dose, just use 75 mg = 1 mEq to figure it out.
If you want to make up your own capsules from powder, you will need a small scale that can measure down to tenths of a mg.
Depending on dose needed, slow release may or may not be all that necessary (see link). Probably just a divided dose taken twice a day would do it.